/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package javax.el;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
 *
 */
public abstract class ELContext {

	private Locale locale;

	private Map<Class<?>, Object> map;

	private boolean resolved;

	/**
	 *
	 */
	public ELContext() {
		this.resolved = false;
	}

	// Can't use Class<?> because API needs to match specification

	/**
	 * Obtain the context object for the given key.
	 *
	 * @param key The key of the required context object
	 * @return The value of the context object associated with the given key
	 * @throws NullPointerException If the supplied key is <code>null</code>
	 */
	public Object getContext(@SuppressWarnings("rawtypes") Class key) {
		if (key == null) {
			throw new NullPointerException();
		}
		if (this.map == null) {
			return null;
		}
		return this.map.get(key);
	}

	// Can't use Class<?> because API needs to match specification

	/**
	 * Add an object to this EL context under the given key.
	 *
	 * @param key           The key under which to store the object
	 * @param contextObject The object to add
	 * @throws NullPointerException If the supplied key or context is <code>null</code>
	 */
	public void putContext(@SuppressWarnings("rawtypes") Class key,
	                       Object contextObject) throws NullPointerException {
		if (key == null || contextObject == null) {
			throw new NullPointerException();
		}

		if (this.map == null) {
			this.map = new HashMap<Class<?>, Object>();
		}

		this.map.put(key, contextObject);
	}

	public boolean isPropertyResolved() {
		return this.resolved;
	}

	public void setPropertyResolved(boolean resolved) {
		this.resolved = resolved;
	}

	public abstract ELResolver getELResolver();

	public abstract FunctionMapper getFunctionMapper();

	public abstract VariableMapper getVariableMapper();

	public Locale getLocale() {
		return this.locale;
	}

	public void setLocale(Locale locale) {
		this.locale = locale;
	}
}
